Dynamo-electric machine.



J. J. WOOD. DYNAMO ELECTRIC MACHINE. APPLIGATION FILED JULY 1, 1912.

Patented Mar. 23, 1915.

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-JAMES J'. WOOD, OF FORT WAYNE, INDIANA, ASSIGNOR TO GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

DYNAMO-ELEOTRIC MACHINE.

Specification of Letters Patent.

Patented Mar. 23, 1915.

Application filed July 1, 1912. SeriaI'No. 706,853.

To all whom it may concern:

Be it known that 1, JAMES J. VVooD, a citizen of the United States, residing at Fort Wayne, county of Allei1, State ,of Indiana, have invented certain new and useful Improvements in Dynamo-Electric Machines, of which the following is a specification.

My invention relates todynamo electric machines andis particularly applicable to small machines such as those of fractional horsepower.

My invention has for its object a novel construction of field magnet which is cheap and permits the use of form-wound field coils. Form-wound field coils are neat in appearance and a given number ofturns can be wound in a much smaller space than is the case with hand-wound coils, consequently the dynamo electric machine may be made smaller by the use of form-wound coils.

The various features of novelty which characterize my invention are pointed out with particularity in the claims annexed to and forming a part of this specification. I

For a better understanding of my invention, reference ma be had to the following description taken 1n connection with the accompanying drawing in which- Figure l is a side elevation of a dynamo electric machine embodying my invention; Fig. 2 is a longitudinal section of the machine of Fig. 1; Fig. 3 is a front elevation of the field magnet of the machine of Fig. 1 with the field coils in section, and Fig.4 is an end elevation of the field magnet of Fig.- 3 with the field coils removed.

In the drawing, I' have illustrated my invention in a dynamo electric machine which rotates an eccentrically mounted weight so that the whole machine vibrates and may I therefore be usedas a hand massage vi- ,5 surround the ton struct each of the parts of the field magnet brator. This, however, forms no part of my invention.

The dynamo electric machine comprises a field magnet structure 1 and an armature 2. The field magnet 1 consists of only two parts, each of which has a central pole piece 3, and tongues 4 and grooves at both ends thereof. The two parts of the field magnet fit together to form a complete magnetic circuit, the tongues 4 on one part fitting into the grooves on the other part. Field coils gues 4. I preferably constructure out of laminations, each of which projections enter the field coils, the projections which form the tongues 4: of one part fitting into the grooves of the other part so as to form a complete magnetic circuit. A continuous casing 6 fits about the outer periphery of the field magnet structure to hold the parts thereof together.

The armature 2 is mounted on a shaft 7 which is journaled in end members 8, 9. Preferably the members forming each part of the field magnet structure are fastened together by rivets and the end members 8 and 9 are fastened to the field magnet structure by means of bolts 10 which are screwed into the rivets 11. These rivets hold the members, which form the parts of the field magnet structure, together.

I have shown the armature 2 provided with a commutator 12 on which brushes 13 bear. Leads 14 connect the dynamo electric machine with a source of current, which may be either direct or alternating current. A switch 15 is provided in the end member 8 so that the current maybe easily cut oif from the machine. Mounted on one end of the armature shaft is the eccentrically mounted weight 16, which is covered by a cap 17 screwed on the end of the end member 9.

I desire it to be understood that my invention is not limited to the particular construction shown and described and I aim in the appended claims to cover all modifications which do not depart from the spirit and scope of my invention. i

What I claim as new and desire to secure by Letters Patent of the United States, is

"1. In adynamo electric machine, a field magnet structure consisting of only two parts, each part consisting of a central pole piece and tongues and grooves at the ends,

tongues, and a continuous casing fitting 11o about the outer periphery of said field magnet structure to hold the parts thereof together.

2. In a dynamo electric machine, a field magnet structure consisting of only two parts, each part consisting of members having a central pole-shaped portion and long and short projections at the ends, said central pole shaped portions and said projections being integral, said members being reverse'ly placed so as to form tongues and grooves, said parts fitting together to form a complete magnetic circuit, the tongues of one part fitting into the grooves of the other part, field coils surrounding said projections, and a continuous casing fitting about the outer periphery of said field magnet structure to hold the parts thereof together.

3. In a dynamo electric machine, a field JAMES J. Woon.

Witnesses:

A. L. HADLEY, A. 'WELCH. 

